Adding timestamp-related APIs.
Using the cached timestamp values in the implementation of timestamp APIs, which means that (1) no trip to the database, instead using a cache that was already there from the beginning, and (2) the returned timestamp reflects the actual value that's available in the memory cache, instead of what's on disk, which could potentially not be cached yet.
Updating timestamp test to take into account the new timestamp implementation. The test is however failing; some work is needed.
Setting the database timestamp for the readwrite (local) database as well.
Adjusting expectations in the timestamp test.